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μ₀ I₁I₂
F₁ = _______
2π a₁
μ₀ (2I) (4I)
F₁ = __________
2π (a)
4μ₀I²
F₁ = ______
πa
Besar F₂ :
μ₀ I₁I₂
F₂ = _______
2π a
μ₀ (2I) (4I)
F₂ = __________
2π (4a)
μ₀I²
F₂ = _____
πa
F = F₁ - F₂
4μ₀I² μ₀I²
F = _____ - _____
πa πa
3μ₀I²
F = _____
πa
Jadi, gaya pada kawat persegi sebesar 3μ₀I²/ πa (Jawaban D)